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It has been a while

I would like to say I haven't seen someone for a while. Which one of the followings is most appropriate? Thanks a lot.

1. It has been a while since our last meet.2. It has been a while that we haven't seen each other.3. It has been a while since we've seen other.

Although I've read this thread and its answer, I'm still a bit confused about it. I would also give the same answer as engee30, since I was taught about the structure It has been (a period of time) since S + last + V-ed. But I'm wondering if the first two of the three options originally given by spaceniuzai are acceptable/correct, too (I suppose the third is incorrect).
Really sorry for creating this thread just to ask about the issue already asked and answered, but I just want to know if there are alternatives to express the same idea in this case. Thank you all in advance!